[COOK-4081] Use passenger.ruby_bin for install command.
[COOK-4081] Use passenger.ruby_bin for install command.

The passenger apache template is correctly using the passenger.ruby_bin
attribute. The installer command does not. This commit fixes the
behavior, now the template and the installer command use the same ruby.

RLRickard/passenger_apache2,petracvv/passenger_apache2,chef-cookbooks/passenger_apache2,opscode-cookbooks/passenger_apache2,urbanautomaton/passenger_apache2,petracvv/passenger_apache2,chef-cookbooks/passenger_apache2,RLRickard/passenger_apache2,mattcl/passenger_apache2,opscode-cookbooks/passenger_apache2